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Steps involved in using Pulse and Wait
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Step 1 involves Thread A acquiring a lock to the shared locking object. Once that lock is acquired, the Wait method of the Monitor class is used on the shared locking object. This places Thread A into the WaitSleepJoin state. Recall that in this state the thread is essentially idle. The first two lines of the following code example demonstrate steps 1 and 2. In the following example QueueWaitLock is the shared locking object referred to in the diagram.
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Monitor.Enter(QueueWaitLock); Result= Monitor.Wait(QueueWaitLock,60000); if (Result)
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THE MONITOR CLASS
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{ Debug.WriteLine("Pulsed"); } else { Debug.WriteLine("Timed out"); } Monitor.Exit(QueueWaitLock);
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Both Wait and Pulse must be invoked from within a region of code guarded by a synchronization block. All this means is that a Monitor.Enter and Monitor.Exit must surround the Monitor.Wait and Monitor.Pulse methods. The motivation for this is to eliminate the possibility of a race condition occurring. By ensuring that only one thread at a time can call Wait or Pulse, the chance of a race condition occurring is eliminated. Additionally, the same object that is locked on using the Monitor.Enter method must also be the object that is passed to the Pulse and Wait methods.
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Monitor.Wait
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Monitor.Wait is a static method that allows a thread to enter a WaitSleepJoin state. The thread will exit the WaitSleepJoin state when the object being waited on is signaled using the Pulse or PulseAll
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method or an optional timeout value expires.
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Pulse signals one thread that is waiting on the synchronized object. Like Wait, Pulse must be invoked from within a synchronized section of code.
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Monitor.Pulse Monitor.Pulse is a static method of the Monitor class that allows a
thread to signal one of the threads that have previously called Wait on a shared object.
The process begins with acquiring a lock on the object being waited on. This corresponds to step 3 in the diagram. Once acquired, the Pulse method is invoked (step 4). After Pulse the lock should be released (step 5). The following code example demonstrates steps 3 5 in the diagram at the start of this module. TryEnter is used in place of Enter.
Entered = Monitor.TryEnter(QueueWaitLock,1000); if (Entered) { Monitor.Pulse(QueueWaitLock); Monitor.Exit(QueueWaitLock); } else { Trace.WriteLine("Unable to add entry"); }
Notice that we use TryEnter to attempt to acquire the lock. We wait for at most one second for the lock. If we are unable to acquire the lock, we log the condition and 134
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return. This prevents a thread from getting stuck waiting on another thread that may not be responding. Once a thread invokes Pulse, it must call the Monitor.Exit method to allow those threads that are waiting on the object to continue. To be precise, if step 5 in figure 7.16 does not occur, neither will step 6. At the point Wait is invoked, the lock on the shared locking object is released automatically, allowing a different thread to acquire a lock on the shared locking object and perform a Pulse. For the thread that was in the WaitSleepJoin state to continue, Thread A in our example, it must reacquire a lock, on the shared locking object. For it to successfully reacquire the lock the Pulsing thread, Thread B, must release the lock.
STEPS TO WAIT
1 2 3 1 2 3
Acquire a lock on the waiting object using the Enter method. Invoke Wait with an optional timeout. Release the lock using the Exit method. Acquire a lock on the waiting object using the Enter method. Invoke the Pulse method. Release the lock using the Exit method.
The steps the waiting thread goes through are outlined in figure 7.17.
STEPS TO PULSE
The states a thread goes through when Wait and Pulse are used
THE MONITOR CLASS
A thread goes through distinct states when Wait and Pulse are used. When the Wait statement is executed, the thread enters the waiting queue. The thread exits the waiting queue if it receives a pulse, or if a timeout occurs. Once it exits the waiting queue, it is added to the ready queue. When it can reacquire the lock, it will resume execution.
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